Osmosis and Tonicity
Define osmosis. _____________________________________
In which direction does water move across membranes, up or down the concentration gradient? ________________
Define these 3 terms: a. isotonic- _____________________________________ b. hypertonic _____________________________________ c. hypotonic _____________________________________
Use arrows to show the direction of water movement into or out of each cell. Color and label the cell in an isotonic environment light blue, the hypotonic environment yellow, and the hypertonic environment light green.
Match the description or picture with the osmotic condition:
A. Isotonic _____ solution with a lower solute concentration
_____ solution in which the solute concentration is the same
B. Hypertonic _____ condition plant cells require
_____ condition that animal cells require
C. Hypotonic _____ red blood cell bursts (cytolysis)
_____ plant cell loses turgor pressure (Plasmolysis)
_____ solution with a higher solute concentration
_____ plant cell with good turgor pressure
_____ solution with a high water concentration

Label the tonicity for each solution (isotonic, hypotonic, or hypertonic):
____________ ____________ ____________
____________ ____________ _ ___________